If you arrived via the googley, SPOILERS SPOILERS SPOILERS! Go away! Run! I like to ruin the whole thing and this book is new -- it's really just immoral and wrong of me but I'm going to do it anyway.
In this outing, Rachel starts out with Trent's silver bracelet keeping her hidden from the demons but simultaneously cutting her off from using any ley-line magic. She can still do earth magic, but her blood will no longer kindle some of the more complex charms. Meanwhile, because she is Out as a demon, she's having all kinds of trouble: getting her car registered in her own name, getting a driver's license, dealing with the lawsuits, not being listed as dead, etc.
She's called in by I.S. (her former employer) to look at a crime scene, only to discover that this is the third in a series and she hadn't been called in to the other ones because they were suspicious she was the one committing the crimes. Once she (and the rest of Vampiric Charms) are on site, they realize it's a human hate group, HAPA. She tracks down one of their sites and finds another body, which enables her to find a third site where they are still working on another victim, Winona. At this point, she is kidnapped and she gets to spend some time contemplating really why she didn't have Trent remove that bracelet sooner, as her captors take her blood and use it to commit still more mayhem while she remains comparatively powerless.
As usual, Rachel is mourning past/failed/changed relationships (in this case, worrying some about Pierce, feeling a little sad that Glenn and Ivy are moving on, watching Belle and Jenks work together to keep the pixie clan going) that no longer involve her intimately (and getting Kisten's pool table repaired) while simultaneously stringing along other possible relationships (Trent, notably, and the body guard Were Wayde, sent along by Takata and Rachel's mum to keep her from getting jumped while she's going about the more ordinary parts of her life).
Al's gone for most of the book and shows up mostly at the point where Rachel finally decides to come out of hiding/get back in touch with her powers and then again at the end, where it is finally driven home to a variety of people that Al is not as powerful as he would like people to believe.
We learn in the course of the book that neither Pierce nor Jonathan are dead, relieving Rachel of some small fraction of the guilt she likes to beat herself up with when things are going along too well.
I have one small quibble with the book: wow, did they all take way too long to figure out that whole Dr. Cordoba thing. That was completely obvious right from the beginning. Cranky creaky plot engine moving people along.
I'll keep reading The Hollows.